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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">+1 for not trusting the algorithm in the JWT header to avoid these attacks:
<a href="https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/">
https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Should do more than just signature validation though to be secure:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">Expiration check<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">Audience check<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">Subject check<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">This is a pretty good overview of the mechanics:
<a href="http://www.cloudidentity.com/blog/2014/03/03/principles-of-token-validation/">
http://www.cloudidentity.com/blog/2014/03/03/principles-of-token-validation/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">-Jason<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><keycloak-user-bounces@lists.jboss.org> on behalf of Stian Thorgersen <sthorger@redhat.com><br>
<b>Reply-To: </b>"stian@redhat.com" <stian@redhat.com><br>
<b>Date: </b>Wednesday, May 18, 2016 at 10:01 PM<br>
<b>To: </b>Josh Cain <josh.cain@redhat.com><br>
<b>Cc: </b>Aikeaguinea <aikeaguinea@xsmail.com>, "keycloak-user@lists.jboss.org" <keycloak-user@lists.jboss.org><br>
<b>Subject: </b>Re: [keycloak-user] Validating JWT tokens<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You can also use <a href="https://github.com/keycloak/keycloak/blob/master/core/src/main/java/org/keycloak/RSATokenVerifier.java">https://github.com/keycloak/keycloak/blob/master/core/src/main/java/org/keycloak/RSATokenVerifier.java</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 11 May 2016 at 15:50, Josh Cain <<a href="mailto:josh.cain@redhat.com" target="_blank">josh.cain@redhat.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I recently put together a quick test for this as well using jjwt:
<a href="https://github.com/cainj13/jwtExamples/blob/master/src/test/java/jcain/example/TokenParseTest.java" target="_blank">
https://github.com/cainj13/jwtExamples/blob/master/src/test/java/jcain/example/TokenParseTest.java</a><o:p></o:p></p>
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<p class="MsoNormal">Pretty similar to the gist that Thomas mentioned above.<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#888888"><br clear="all">
</span><span class="hoenzb"><span style="color:#888888"><o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="color:#888888">Josh Cain | Software Applications Engineer</span><o:p></o:p></p>
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<p class="MsoNormal"><i><span style="color:#888888">Identity and Access Management</span></i><span style="color:#888888"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:#888888">Red Hat</span></b><span style="color:#888888"><br>
<a href="tel:%2B1%20843-737-1735" target="_blank">+1 843-737-1735</a><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, May 11, 2016 at 4:09 AM, Thomas Darimont <<a href="mailto:thomas.darimont@googlemail.com" target="_blank">thomas.darimont@googlemail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hello, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">another example for (Parsing) & Validating a Keycloak JWT was posted on the ML a few months ago:<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://lists.jboss.org/pipermail/keycloak-user/2016-March/005325.html" target="_blank">http://lists.jboss.org/pipermail/keycloak-user/2016-March/005325.html</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In the example the token is only successfully parsed when the token is valid.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Thomas<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2016-05-11 10:45 GMT+02:00 Gerard Laissard <<a href="mailto:glaissard@axway.com" target="_blank">glaissard@axway.com</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">My 2 cents:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">There is an openSSL example to verify a jwt:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><a href="https://gist.github.com/rolandyoung/176dd310a6948e094be6" target="_blank">https://gist.github.com/rolandyoung/176dd310a6948e094be6</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">By using jose4j</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> // be sure you do not have any EOL at the end of the token</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">String accesToken = …;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">accesToken = accesToken.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"\r\n"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">accesToken = accesToken.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"\n"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">JsonWebSignature
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">jws</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> JsonWebSignature();</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">jws</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.setCompactSerialization(accesToken);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">jws</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.setKey(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">publicKey</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">boolean signatureVerified = jws.verifySignature();</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">To get a PublicKey : if you put the content of the realm public you get from keycloak admin
</span><o:p></o:p></p>
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<span style="font-size:8.0pt;font-family:Consolas;color:black"> </span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">public</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> PublicKey
<span style="background:silver">getPublicKey</span>(String </span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">fileName</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">) {</span><o:p></o:p></p>
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<span style="font-size:8.0pt;font-family:"Courier New";color:black">File </span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">f</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> File(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">fileName</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
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<b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">try</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> (FileInputStream
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">fis</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> FileInputStream(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">f</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">DataInputStream
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">dis</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> DataInputStream(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">fis</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);)
{</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">byte</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">[]
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">keyBytes</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">byte</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">[(</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">int</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">)
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">f</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.length()];</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">dis</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.readFully(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">keyBytes</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">dis</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.close();</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> // convert to der format</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> String pem = new String(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">keyBytes</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"-----BEGIN (.*)-----"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"-----END (.*)----"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"\r\n"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">pem</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.replaceAll(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"\n"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">""</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New""> byte[] der = Base64.getDecoder().decode(pem); // java 8</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:black">X509EncodedKeySpec
</span><span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">spec</span><span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:black"> =
</span><b><span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:black"> X509EncodedKeySpec(der);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="FR" style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">KeyFactory
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">kf</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> = KeyFactory.<i>getInstance</i>(</span><b><i><span style="font-size:8.0pt;font-family:"Courier New";color:#0000C0">RSA</span></i></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">return</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">kf</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">.generatePublic(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">spec</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> } </span>
<b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">catch</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> (IOException | InvalidKeySpecException | NoSuchAlgorithmException
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">e</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">) {</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">throw</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black">
</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#7F0055">new</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:black"> RuntimeException(</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"Failed
to load public key from file '"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> +
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">fileName</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"> +
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#2A00FF">"'"</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">,
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#6A3E3E">e</span><span style="font-size:8.0pt;font-family:"Courier New";color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> }</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:"Courier New";color:black"> }</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">With Java 8, it is quite simple too</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">
</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">String[] tokenParts</span><span style="font-size:8.0pt;font-family:Calibri;color:#1F497D"> =
</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">accessToken.split("\\.");</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:.5in">
<span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">// detect algo from tokenParts[0] or put "SHA256withRSA” (for “RS256”)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:8.0pt;font-family:Calibri;color:#1F497D">
</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">String jwtSignAlgo = "SHA256withRSA";
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E"> String jwtInputString = tokenParts[0] + “.” + tokenParts[1];</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E"> String jwtDecodedSign = new String(Base64.getUrlDecoder().decode(tokenParts[2]);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E"> </span>
<span lang="FR" style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">Signature verifier = Signature.getInstance(jwtSignAlgo);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="FR" style="font-size:8.0pt;font-family:Consolas;color:black">
</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">verifier</span><span style="font-size:8.0pt;font-family:Consolas;color:black">.initVerify(</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">publicKey</span><span style="font-size:8.0pt;font-family:Consolas;color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:Consolas;color:black"> </span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">verifier</span><span style="font-size:8.0pt;font-family:Consolas;color:black">.update(</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">jwtInputString</span><span style="font-size:8.0pt;font-family:Consolas;color:black">.getBytes("UTF-8"));</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:8.0pt;font-family:Consolas;color:black"> boolean </span>
<span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">signatureVerified</span><span style="font-size:8.0pt;font-family:Consolas;color:black"> =
</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">verifier</span><span style="font-size:8.0pt;font-family:Consolas;color:black">.verify(</span><span style="font-size:8.0pt;font-family:Consolas;color:#6A3E3E">jwtDecodedSign</span><span style="font-size:8.0pt;font-family:Consolas;color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">gerard</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:Tahoma">From:</span></b><span style="font-size:10.0pt;font-family:Tahoma">
<a href="mailto:keycloak-user-bounces@lists.jboss.org" target="_blank">keycloak-user-bounces@lists.jboss.org</a> [mailto:<a href="mailto:keycloak-user-bounces@lists.jboss.org" target="_blank">keycloak-user-bounces@lists.jboss.org</a>]
<b>On Behalf Of </b>Stian Thorgersen<br>
<b>Sent:</b> vendredi 6 mai 2016 07:33<br>
<b>To:</b> Aikeaguinea<br>
<b>Cc:</b> keycloak-user<br>
<b>Subject:</b> Re: [keycloak-user] Validating JWT tokens</span><o:p></o:p></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On 4 May 2016 at 18:37, Aikeaguinea <<a href="mailto:aikeaguinea@xsmail.com" target="_blank">aikeaguinea@xsmail.com</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Figured it out, kinda. I have to use the Realm public key, and at least<br>
in <a href="http://jwt.io" target="_blank">jwt.io</a> it has to begin with "-----BEGIN PUBLIC KEY-----" and end with<br>
"-----END PUBLIC KEY-----" -- these can't be omitted.<br>
<br>
If I try using the Realm certificate, it won't work, however, whether or<br>
not I use "-----BEGIN CERTIFICATE-----"/"-----END CERTIFICATE-----".<br>
<br>
If I use the validator at <a href="http://kjur.github.io/jsjws/tool_jwt.html" target="_blank">
http://kjur.github.io/jsjws/tool_jwt.html</a> and<br>
select "default X509 Certificate (RSA z4) it tells me "Error: malformed<br>
X.509 certificate PEM (code:003)"<br>
<br>
I can use the Realm public key for validating the JWT, but shouldn't the<br>
certificate work as well?<o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The certificate is only used by SAML, so no you can't verify the JWT with the certificate only the public key.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><br>
On Wed, May 4, 2016, at 12:00 PM, Aikeaguinea wrote:<br>
> I have a client with a service account and credentials using Signed Jwt.<br>
> Authentication works fine. The service uses<br>
> org.keycloak.adapters.authentication.ClientCredentialsProviderUtils#setClientCredentials<br>
> to create the JWT token and set the headers, and I get back a JWT<br>
> containing an access token from Keycloak.<br>
><br>
> However, when I use <a href="http://jwt.io" target="_blank">jwt.io</a> to look at the access token, I can't validate<br>
> the signature. This is true whether I use the client Certificate (from<br>
> the client's Credentials tab), the Realm public key, or the Realm<br>
> Certificate. In addition, I have generated the client's public key from<br>
> the certificate using<br>
><br>
> keytool -exportcert -alias x -keypass y -storepass z -rfc -keystore<br>
> client-keystore.jks | openssl x509 -inform pem -pubkey<br>
><br>
> on the jks file supplied when I generated the client credentials, and<br>
> that doesn't work either.<br>
><br>
> We've also been having trouble validating the signature programmatically<br>
> using Java.<br>
><br>
> Any idea why I might be seeing this?<br>
><br>
> --<br>
> <a href="http://www.fastmail.com" target="_blank">http://www.fastmail.com</a> - Or how I learned to stop worrying and<br>
> love email again<br>
><br>
<br>
<br>
<span style="color:#888888">--<br>
Aikeaguinea<br>
<a href="mailto:aikeaguinea@xsmail.com" target="_blank">aikeaguinea@xsmail.com</a><br>
<br>
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